[crankshaft] There is no guarantee that allocations are folded in Crankshaft.

src/crankshaft/hydrogen-instructions.h

Index: src/crankshaft/hydrogen-instructions.h
diff --git a/src/crankshaft/hydrogen-instructions.h b/src/crankshaft/hydrogen-instructions.h
index fdb1fd6d46c5cea8a8f77458d8297f5e8980b51d..f3d0b974ae27d856212966648abed1f67802ed74 100644
--- a/src/crankshaft/hydrogen-instructions.h
+++ b/src/crankshaft/hydrogen-instructions.h
@@ -5148,8 +5148,11 @@ inline bool ReceiverObjectNeedsWriteBarrier(HValue* object,
     HAllocate* allocate = HAllocate::cast(object);
     if (allocate->IsAllocationFolded()) {
       HValue* dominator = allocate->allocation_folding_dominator();
-      DCHECK(HAllocate::cast(dominator)->IsAllocationFoldingDominator());
-      object = dominator;
+      // There is no guarantee that all allocations are folded together because
+      // GVN performs a fixpoint.
+      if (HAllocate::cast(dominator)->IsAllocationFoldingDominator()) {
+        object = dominator;
+      }
     }
   }